Thanks to

• the developer of the software TOOLBOOK 1.5 (Asymetrix), who had stand by the platform for programming of the Experiments
• the Toolbook-Mailinglist Toolb-l for some valuable tips.
• the experimental Subjects for their participation without paying.
• Rowan Smith and Patric Beuthen for the english translation.
• the german tax-payer, who financed my job and so made the project possible.